When heterozygous red flowered plant is crossed with white flowered plant, the progeny will show ratio of

350 red : 350 white

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450 red : 250 white

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380 red : 220 white

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None of the above

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Solution

The correct option is C 350 red : 350 white
Red flower colour is dominant over white; thus genotype of heterozygous red flowered plant is "Rr" and that of white flowered plant is "rr"
Parent generation : Rr x rr
Gametes
Rr ---->
rr R r
r Rr
(red) rr
(white)
Thus, phenotypic ratio 1 red: 1 white; The ratio given in option A; "350 red: 350 white" satisfies the 1:1: ratio. Correct answer is option A.
Ratio in option B gives 1.8 red : 1 white while that in option C gives 1.7 : 1; which makes these two options wrong.

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